A UBBP is a universal baseband processing unit and can be installed in a BBU3900 or BBU3910.
1R and 2R can be configured together in any forms. In hybrid configuration, the total of cannot exceed the of 2R supported by the eNodeB.
The UBBPd4/UBBPda does not support the hybrid configuration of 1R and 4R , or 2R and 4R .
The UBBPd5 supports hybrid configuration of 1R and 4R , or 2R and 4R . In hybrid configuration, a maximum of three are supported.
The UBBPd6 supports hybrid configuration of 1R and 4R , or 2R and 4R . In hybrid configuration, a maximum of three 1R/2R and three 4R are supported.